Going fishing up in Mammoth Lakes for a week. We're leaving Sunday, so I thought I should replace my two T105 6V that could not hold a full charge since we plan on boon docking in one of the Mammoth ...
Make sure you have 12V from the batteries to the controller with a meter. Then connect the solar panels to the controller.
For cleaning circuit boards, I use a variety of soft brushes and compressed air. That is followed by a cleaner and Q-tips. After all is removed, I spray with a contact cleaner or a splash of alcohol. Let everything dry and test.
The wasps may have shorted the controller circuit board. Their wet mud on the board might be enough to short a component on the board.
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